Key chain



FIG. 1 is a perspective top view of an embodiment of a key chain, showing my design;

FIG. 2 is a perspective bottom view of an embodiment of the key chain;

FIG. 3 is a top view of an embodiment of the key chain;

FIG. 4 is a bottom view of an embodiment of the key chain;

FIG. 5 is a first side view of an embodiment of the key chain;

FIG. 6 is a second side view, opposite the first side view of FIG. 5 , of an embodiment of the key chain;

FIG. 7 is a front (or third side) view of an embodiment of the key chain; and,

FIG. 8 is a back (or fourth side opposite the third side) view of an embodiment of the key chain.

The broken lines in the figures represent environmental structure of the key chain and form no part of the claimed design. 

CLAIM The ornamental design for a key chain, as shown and described. 